/Engine/Source/Developer/TargetPlatform/Public/Interfaces/ITargetPlatformModule.h
This is where each platform module will fill out an array
void GetTargetPlatforms ( [TArray](API\Runtime\Core\Containers\TArray)< [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * > & TargetPlatforms )